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Internal cylindrical grinder spindle lubrication


Aug 12, 2018
A while ago I bought a spindle from a cylindrical grinder to use it on my lathe. I'm setting up a prototyping shop and I don't have space for a proper cylindrical grinder, so this is the next best thing.

I have no idea, however, how to lubricate the spindle. It's KR40-250 model from a company named Malcus with max speed of 30k RPM. Nothinng meaningful in google, but it looks very similar to spindles from Fortuna, Jotes and other European grinders. There are two setscrews there, but I have zero idea what they are for. Any ideas? Should I try to open it and use some kind of high qualuty grease? Or is there any way to apply oil? Initially I thought those setscrews might guard oil entry, but it doesn't look like it. Any ideas welcomed!


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Diamond; Mod Squad
Mar 27, 2005
Northwest Indiana, USA
The spindle cartridge from my toolpost grinder looks similar, and has setscrew holes like that. The manual says to remove the setscrews and add oil before running. I use a light oil similar to the old Mobil DTE light.


Jun 28, 2012
Mt Clemens, Michigan 48035
For my tool post spindle, I add about 5 drops oil tilting one end up, and then add about 5 drops with the other end pointing up.

I don't oil it every time I use it if I have recently used it./ but every time would be OK.


Sep 25, 2011
Garbsen, Germany
The screw labeled "Nachst" is short for "Nachstellen" which in this case means adjustment of the bearing play/preload. The spindle looks a lot like a Fischer/SFJ UJ40, so if you drop me an Email I'll send you a manual for that. The end play is typically adjusted cold, by
loosening then snugging the screw.